Third-rail brake.



W. M. DILLIARD. THIRD RAI'L BRAKE. AYPLIOATION FILED JULY 23, 1910.

987,052. Patented Mar. 14, 1911.

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w. M.- DILLIARD.

THIRD RAIL BRAKE.

I 'APILIOL'TIOK FILED JULY 23,1910.

' Patented Man-14,1911.

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WILLIAM M. DILLIARD, OF BETHLEHEM, PENNSYLVANIA.

THIRD-RAIL BRAKE.

Specification of Letters Patent.

Application filed July 23, 1910.

Patented Mar. 14, 1911.

Serial No. 573,432.

To all whom it may concern:

Be it known that I, WILLIAM M. DILLIARD, a citizen of the United States, residing at Bethlehem, in the county of Northampton and State of Pennsylvania, have invented new and useful Improvements in Third- Rail Brakes, of which the following is a specification.

This invention relates to car brakes and more particularly to safety brakes.

The particular object of this invention is to provide a safety brake which may be used in connection with the ordinary brakes on steep hills. Frequently the ordinary brakes are not sufficiently strong to stop the car and auxiliary brakes of some character are absolutely necessary.

It is the object of this invention to provide a novel and efiicient safety brake operating mechanism which will force the shoes downwardly into engagement with a third rail which is provided only upon the hills where it is necessary to use this type of brake, and further means for accommodating the brake shoes to the rail whereby an even grip on. each side is produced.

A further object of the invention is the provision of a reciprocating and rotating brake shoe shaft which is controlled by a pair of adjustable cams whereby the shoes are lowered into position to engage the rail and are automatically brought together with equal force on opposite sides of the rail.

Further objects of the invention will ap pear as the following specific description is read in connection with the accompanying drawing which forms a part of this application and in which:

Figure 1 is a top plan view of the truck showing the invention applied thereto. Fig. 2 is a detail side elevation with parts broken away. Fig. 3 is a bottom plan view of a portion of the truck. Fig. 4 is a transverse section through the truck.

Referring more particularly to the drawing 1 represents the truck which is of the ordinary construction and is provided with cross bars 2 which support the upper and lower plat-forms 3 and 4 in which is journaled the vertical brake shaft 5. The lower end of this shaft has secured thereto a cross head 6 upon which are pivoted the rail shoes 7 which are adapted to engage on opposite sides of the third rail 8 which is positioned upon the road bed intermediate the track rails 9. The shaft 5 is normally held in raised position with the shoes held above the rail by a spiral spring 10 which is arranged around the shaft between a collar 11 secured thereto and the lower platform 4. In this position, the shoes are separated by a pair of pointed pins 12 which engage be tween the shoes and force them apart into parallel position so as to be arranged for proper engagement with the third rail 8.

Adjustably secured upon opposite sides of the platform by means of the screws 13 are the lever guides 14 having the oppositely arranged cams 15 formed therein which act to depress the lever 16 carried upon the upper end of the brake shaft 5. A suitable head 17 is keyed to the shaft and acts to support the lever 16 in position thereon. This head has projecting upwardly therefrom on opposite sides of the lever four stop pins 18 which cause the shaft to turn with the lever when the latter is operated upon by the flexible connection 19 which is wound around the brake staff 20. The lever is retracted to normal position and the brake shoes and shaft raised by means of the springs 21 which are connected to opposite ends of the lever and to adjustable brackets 22 mounted at opposite ends of the platform 3. The brake staff 20 is provided with the usual ratchet wheel 23 and the conventional form of pawl 24 is used to hold the same in adjusted position. It will be noticed that the stop pins 18 are arranged farther apart than the width of the lever 16 so that the latter may move a considerable distance to depress the shaft before it begins to turn the same, thereby placing the shoes in position on opposite sides of the rail before they are clamped thereon.

Having thus described the invention,what is claimedis-- I a y 1. In a third rail brake for car trucks, a bearing member, a brake shaft reciprocally and rotatably mounted therein, a shoe mounting device carried by said shaft, a pair of brake shoes pivotally mounted on said device, and means to depress said shaft and "clamp the shoes upon the third rail.

2. In a third rail brake for car trucks, a bearing member, a brake shaft reciprocally and rotatably mounted therein, a cross head carried by the shaft, a pair of brake shoes pivotally mounted on opposite ends of the cross head, a pair of cam-faced guiding members carried by the truck, a lever carried by the shaft and adapted to be enbearing member, a brake shaft reciprocally and rotatably mounted therein, a cross head carried by the shaft, a pair of brake shoes pivotally mounted on opposite ends of the cross'head, a pair ofcam-faced guiding members adyustably carried by the truck, a

V lever freely mounted on the shaft and adapted'to'operate agalnstthe guldlng members,

means to rotate the lever, and means carried by the shaft and 'coacting with the lever to 'cause successive depression and rotation of the shaft. 7

' at. In a rail brake, areciprocating and rotating brake shaft, of a cross head thereon, a pair of shoes pivotally mounted on opposite ends of the crosshead and adapted to engage on opposite sides of the rail, and means to lower and rotate the shaft.

5. In a rail brake, a reciprocating and rotating brake shaft, of a cross head thereon, a

pair of shoes pivotally mounted on opposite ends of the cross head and adapted to engage on opposite sides of the rail, means to reciprocate and rotate the shaft, and means for holding the shoes in separated position.

In testimony whereof I afiix my signature in presence of two witnesses.

VILLIAM M. DILLIARD. Witnesses E. EDMONSTON, Jr.,

N. K. MoGEE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

